From: Will Deacon Date: Thu, 13 Dec 2018 13:47:38 +0000 (+0000) Subject: arm64: kpti: Whitelist Cortex-A CPUs that don't implement the CSV3 field X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=2a355ec25729053bb9a1a89b6c1d1cdd6c3b3fb1;p=openwrt%2Fstaging%2Fblogic.git arm64: kpti: Whitelist Cortex-A CPUs that don't implement the CSV3 field While the CSV3 field of the ID_AA64_PFR0 CPU ID register can be checked to see if a CPU is susceptible to Meltdown and therefore requires kpti to be enabled, existing CPUs do not implement this field. We therefore whitelist all unaffected Cortex-A CPUs that do not implement the CSV3 field. Signed-off-by: Will Deacon --- diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index e6467e64ee91..7b6f26fd075f 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -946,6 +946,12 @@ static bool unmap_kernel_at_el0(const struct arm64_cpu_capabilities *entry, static const struct midr_range kpti_safe_list[] = { MIDR_ALL_VERSIONS(MIDR_CAVIUM_THUNDERX2), MIDR_ALL_VERSIONS(MIDR_BRCM_VULCAN), + MIDR_ALL_VERSIONS(MIDR_CORTEX_A35), + MIDR_ALL_VERSIONS(MIDR_CORTEX_A53), + MIDR_ALL_VERSIONS(MIDR_CORTEX_A55), + MIDR_ALL_VERSIONS(MIDR_CORTEX_A57), + MIDR_ALL_VERSIONS(MIDR_CORTEX_A72), + MIDR_ALL_VERSIONS(MIDR_CORTEX_A73), { /* sentinel */ } }; char const *str = "command line option";